Bubble dynamics with aerosol during pool scrubbing

Abe, Yutaka; Fujiwara, Kota; Saito, Shigemi; Yuasa, Tomohisa; Kaneko, Akiko

doi:10.1016/j.nucengdes.2018.06.017

Cited by 28 publications

(4 citation statements)

References 6 publications

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“…The same experimental phenomenon also appeared in the study of Bandyopadhyay and Biswas (2006). Recently, Abe et al (2018) visually studied the bubble dynamics with aerosol and flow structure during pool scrubbing and found that the interface oscillation of globules leads to the amount of aerosol collected by liquid phase.…”

Section: Introductionmentioning

confidence: 52%

“…When the superficial gas velocity increases, the fractional gasholdup increases as well as the intensity of interface oscillation and bubble breakup and coalescence. The inertial impaction effect would become a dominant mechanism, which contributed positively to higher particle collection efficiency (Abe et al, 2018). However, when the superficial gas velocity is too large, the coalescence effect of the bubbles was enhanced, which would reduce the interfacial area between gas phase and liquid phase.…”

Section: Influence Of Superficial Gas Velocity On Filtration Efficiencymentioning

confidence: 99%

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Preliminary Experimental Investigation on the Filtration Performance of Submicron Insoluble Aerosol in a Bubble Column

Shi

Sun

et al. 2019

Front. Energy Res.

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Pool scrubbing is a representative process for aerosol retention involved in severe LWR accidents and has proved to be a potential method for the removal of micron-sized aerosols. Bubble scrubbing, as the key component of pool scrubbing, has the advantages of a large gas-liquid contact area and long residence time. However, the filtration mechanism of submicron aerosol by bubble scrubbing is still not clear. Therefore, the goal of this research is to evaluate the filtration performance of submicron insoluble aerosol in a bubble column. Some preliminary experiments were carried out to investigate the influence of operational parameters on aerosol filtration efficiency, such as inlet aerosol concentration, gas flow rate and pool temperature. Mass method was used to analyze the aerosol filtration efficiency. The results show that the aerosol filtration efficiency is independent of inlet aerosol concentration when inlet aerosol concentration is in the range of 0.2-0.5 g/m 3. Besides the aerosol filtration, efficiency is influenced by the superficial gas velocity. With the increase of superficial gas velocity, homogeneous bubbling, transition and a heterogeneous bubbling regime will appear in turn. The aerosol filtration efficiency decreases in the transition regime due to the appearance of large bubbles but increases in the heterogeneous bubbling regime account for intense gas-liquid interaction. Moreover, the aerosol filtration efficiency significantly decreases with pool temperature because the evaporation rate at the gas-liquid interface will significantly increase as the boiling point is approached, which gives retroaction to aerosol filtration efficiency.

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Section: Introductionmentioning

confidence: 52%

Section: Influence Of Superficial Gas Velocity On Filtration Efficiencymentioning

confidence: 99%

Preliminary Experimental Investigation on the Filtration Performance of Submicron Insoluble Aerosol in a Bubble Column

Shi

Sun

et al. 2019

Front. Energy Res.

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“…Hence, increasing the knowledge of the latter dynamics will certainly enhance either the performance of such industrial processes and the nuclear safety assessment through more accurate modeling/simulations. Moreover, high degree of precision of bubbles size is required due to its strong influence in controlling mass transfer phenomena and thus trapping efficiency of contaminants [4][5].…”

Section: Introductionmentioning

confidence: 99%

Characterization of bubbles dynamics in aperiodic formation

Farhat

Chinaud²,

Nerisson³

et al. 2021

International Journal of Heat and Mass Transfer

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“…Bubble size distribution in small-scale test 32) Fig. 7 Comparison of measured bubble aspect ratios with representative correlations in small-scale test 35) 3.…”

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confidence: 99%

Experimental Research on Pool Scrubbing of Particles of Radioactive Materials

Akiba

Hotta

Abe

et al. 2020

Transactions of the Atomic Energy Society of Japan

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Tests at three different scales were conducted in order to understand the mechanisms of pool scrubbing under a wide range of two-phase fluid dynamic conditions with a special focus on rapid depressurization caused by venting. In the small-scale separate effect test, high resolution two-phase flow measurement techniques utilizing equipment such as a high-speed digital camera, wire mesh sensor and PIV were applied to capture the behaviors of a single bubble (deformation, rising velocity and aerosol tracks) and the evolution of two-phase flow structures (bubble globule breakup, bubble sizes, bubble shapes and swarm rising) . In the large-scale integral effect test, the dependence of the aerosol removal efficiency on submergence and pool temperature was measured under constant pressure and depressurized conditions. Attention was also paid to aerosol materials with different particle size distributions, hydrophilicity and solubility from the viewpoint of their importance for aerosol removal efficiency. To clarify relationships between individual phenomena and combined phenomena observed in two tests, the mid-scale integral effect test was undertaken. In this paper, we overviewed existing analytical models of pool scrubbing, their deficiencies to be improved, the purpose of this experimental project, an outline of experimental approaches and findings obtained so far.

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Bubble dynamics with aerosol during pool scrubbing

Cited by 28 publications

References 6 publications

Preliminary Experimental Investigation on the Filtration Performance of Submicron Insoluble Aerosol in a Bubble Column

Preliminary Experimental Investigation on the Filtration Performance of Submicron Insoluble Aerosol in a Bubble Column

Characterization of bubbles dynamics in aperiodic formation

Experimental Research on Pool Scrubbing of Particles of Radioactive Materials

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